/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/*

 * @test

 * @summary Test checks output displayed with jstat -gccause.

 *          Test scenario:

 *          test forces debuggee application call System.gc(), runs jstat and checks that

 *          cause of last garbage collection displayed by jstat (LGCC) is 'System.gc()'.

 * @modules java.base/jdk.internal.misc

 * @library /test/lib

 * @library ../share

 * @run main/othervm -XX:+UsePerfData -Xmx128M -XX:MaxMetaspaceSize=128M GcCauseTest03

 */

import utils.*;

public class GcCauseTest03 {

    private final static float targetMemoryUsagePercent = 0.7f;

    public static void main(String[] args) throws Exception {

        // We will be running "jstat -gc" tool

        JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().pid());

        System.gc();

        // Run once and get the  results asserting that they are reasonable

        JstatGcCauseResults measurement = jstatGcTool.measure();

        measurement.assertConsistency();

        if (measurement.valueExists("LGCC")) {

            if (!"System.gc()".equals(measurement.getStringValue("LGCC"))) {

                throw new RuntimeException("Unexpected GC cause: " + measurement.getStringValue("LGCC") + ", expected System.gc()");

            }

        }

    }

}